wip/lpc55-host 0.2.1 NetBSD

lpc55 provides tooling around the LPC55.

Goals

demystify the LPC55 ROM bootloader (at least for people who know Rust), by
    modeling "protected flash" settings and other sparsely documented data
as Rust types
    implementing its protocol, removing leftover details for older chips
    clarifying the cryptographic details
unify
    NXP's elftosb, blhost and spsdk projects
    molejar's pyMBoot
    ergonomic corresponding TOML-based config files
library-first (independent of CLI), and an HTTP interface
support for non-file based signing keys (via PKCS \#11 URIs)

Examples:

lpc55 info
lpc55 reboot

Examples from inside repository (which includes example binaries, certificates, configurations):

lpc55 fingerprint-certificates example-cfgs/example-cfg.toml
lpc55 sign-fw example-cfgs/example-cfg.toml
lpc55 assemble-sb example-cfgs/example-cfg.toml